<?php

require(CONFIG_PATH . 'upload_setting.php');
$root_path = UPLOAD_PATH;
$root_url = UPLOAD_URL;

//目录名
$dir_name = empty($_GET['dir']) ? '' : trim($_GET['dir']);
if (!array_key_exists($dir_name, $cf_upload_setting)) {
    echo "Invalid Directory name.";
    exit;
}
if ($dir_name !== '') {
    $root_path .= $dir_name . "/";
    $root_url .= $dir_name . "/";
    if (!file_exists($root_path)) {
	mkdir($root_path);
    }
}

//图片扩展名
$ext_arr = $cf_upload_setting[$dir_name]['allow'];

//根据path参数，设置各路径和URL
if (empty($_GET['path'])) {
    $current_path = realpath($root_path) . '/';
    $current_url = $root_url;
    $current_dir_path = '';
    $moveup_dir_path = '';
} else {
    $current_path = realpath($root_path) . '/' . $_GET['path'];
    $current_url = $root_url . $_GET['path'];
    $current_dir_path = $_GET['path'];
    $moveup_dir_path = preg_replace('/(.*?)[^\/]+\/$/', '$1', $current_dir_path);
}
echo realpath($root_path);
//排序形式，name or size or type
$order = empty($_GET['order']) ? 'name' : strtolower($_GET['order']);

//不允许使用..移动到上一级目录
if (preg_match('/\.\./', $current_path)) {
    echo 'Access is not allowed.';
    exit;
}
//最后一个字符不是/
if (!preg_match('/\/$/', $current_path)) {
    echo 'Parameter is not valid.';
    exit;
}
//目录不存在或不是目录
if (!file_exists($current_path) || !is_dir($current_path)) {
    echo 'Directory does not exist.';
    exit;
}

//遍历目录取得文件信息
$file_list = array();
if ($handle = opendir($current_path)) {
    $i = 0;
    while (false !== ($filename = readdir($handle))) {
	if ($filename{0} == '.')
	    continue;
	$file = $current_path . $filename;
	if (is_dir($file)) {
	    $file_list[$i]['is_dir'] = true; //是否文件夹
	    $file_list[$i]['has_file'] = (count(scandir($file)) > 2); //文件夹是否包含文件
	    $file_list[$i]['filesize'] = 0; //文件大小
	    $file_list[$i]['is_photo'] = false; //是否图片
	    $file_list[$i]['filetype'] = ''; //文件类别，用扩展名判断
	} else {
	    $file_list[$i]['is_dir'] = false;
	    $file_list[$i]['has_file'] = false;
	    $file_list[$i]['filesize'] = filesize($file);
	    $file_list[$i]['dir_path'] = '';
	    $file_ext = strtolower(array_pop(explode('.', trim($file))));
	    $file_list[$i]['is_photo'] = in_array($file_ext, $ext_arr);
	    $file_list[$i]['filetype'] = $file_ext;
	}
	$file_list[$i]['filename'] = $filename; //文件名，包含扩展名
	$file_list[$i]['datetime'] = date('Y-m-d H:i:s', filemtime($file)); //文件最后修改时间
	$i++;
    }
    closedir($handle);
}

//排序
function cmp_func($a, $b) {
    global $order;
    if ($a['is_dir'] && !$b['is_dir']) {
	return -1;
    } else if (!$a['is_dir'] && $b['is_dir']) {
	return 1;
    } else {
	if ($order == 'size') {
	    if ($a['filesize'] > $b['filesize']) {
		return 1;
	    } else if ($a['filesize'] < $b['filesize']) {
		return -1;
	    } else {
		return 0;
	    }
	} else if ($order == 'type') {
	    return strcmp($a['filetype'], $b['filetype']);
	} else {
	    return strcmp($a['filename'], $b['filename']);
	}
    }
}

usort($file_list, 'cmp_func');

$result = array();
//相对于根目录的上一级目录
$result['moveup_dir_path'] = $moveup_dir_path;
//相对于根目录的当前目录
$result['current_dir_path'] = $current_dir_path;
//当前目录的URL
$result['current_url'] = $current_url;
//文件数
$result['total_count'] = count($file_list);
//文件列表数组
$result['file_list'] = $file_list;

//输出JSON字符串
//header('Content-type: application/json; charset=UTF-8');
echo json_encode($result);
exit;
